Extract semantic project identifier regex into a composed constant#23197
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The [A-Z][A-Z0-9_]* shape that defines a semantic project identifier appears in three places that each redefine it inline: the validator's body check, the work-package semantic-id pattern composed into the route constraint, and the wiki reverse-link parser. Lift the unanchored shape to Projects::Identifier::SEMANTIC_FORMAT and have WorkPackage::SemanticIdentifier::SEMANTIC_ID_PATTERN compose from it via .source, with ID_ROUTE_CONSTRAINT in turn composing from that. The validator keeps its own anchored start/body patterns because each pattern produces a distinct error message — composing the two from SEMANTIC_FORMAT would obscure that contract. Split out of #22976 so #23186 can introduce its CLASSIC_IDENTIFIER_CHARS counterpart without conflicting with the larger feature PR.
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This was referenced May 13, 2026
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Split out of #22976 at the reviewer's request so #23186 can land its symmetric
CLASSIC_IDENTIFIER_CHARSrefactor without waiting on the larger feature PR.